Honestly it's G2 comics Sideswipe that makes the character for me. G1 Sideswipe comes to my mind as just "that red car guy"(whether he actually is or not) and turning him into Cable-As-Autobot(considering the guns) is how I remember him the best. The only pre-G2 significant thing that comes to my mind is the whole Jet Judo bit. Even if he doesn't have the look, I like that that got carried onward in IDW from what I recall of his portrayal there.
On the other hand, Ironhide, Wheeljack, Prowl, and Ratchet are definitely NOT niche characters for 84-85. Yes, it didn't have the much tighter focus that S3 had with the movie crew, but if I were to name characters that were main characters for S1-S2, those names would be among them. Heck, two of them are the ones who MADE the Dinobots in the cartoon.
On the other hand, Ironhide, Wheeljack, Prowl, and Ratchet are definitely NOT niche characters for 84-85. Yes, it didn't have the much tighter focus that S3 had with the movie crew, but if I were to name characters that were main characters for S1-S2, those names would be among them. Heck, two of them are the ones who MADE the Dinobots in the cartoon.